Audio recompression from higher rates for karaoke, video games, and other applications

• US 5,974,387 A
• Filed: 06/17/1997
• Issued: 10/26/1999
• Est. Priority Date: 06/19/1996
• Status: Expired due to Term

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Semba, Youji, Koezuka, Shinji, Kageyama, Yasuo
• Primary Examiner(s): Hudspeth, David R.
• Assistant Examiner(s): Smits, Talivaldis Ivars
• Application Number:
  US08/877,169
• Time in Patent Office: 861 Days
• Field of Search: 704/500, 84/645
• US Class Current: 704/500
• CPC Class Codes: G10H 1/361 Recording/reproducing of accompaniment for use with an external source, e.g. karaoke systems
• CPC Class Codes: G10H 2220/011 Lyrics displays, e.g. for karaoke applications
• CPC Class Codes: G10H 2240/056 MIDI or other note-oriented file format
• CPC Class Codes: G10H 2250/031 Spectrum envelope processing
• CPC Class Codes: G10H 2250/225 MDCT [Modified discrete cosine transform], i.e. based on a DCT of overlapping data
• CPC Class Codes: G10H 2250/235 Fourier transform; Discrete Fourier Transform [DFT]; Fast Fourier Transform [FFT]
• CPC Class Codes: G10H 2250/595 ADPCM [adaptive differential pulse code modulation]
• CPC Class Codes: G10H 7/12 by means of a recursive algorithm using one or more sets of parameters stored in a memory and the calculated amplitudes of one or more preceding sample points

Abstract

Sampled sound data is compressed with a vector quantizing technique and then transmitted via a communication line. Received sound data is decoded, compressed with an ADPCM technique, and then stored into a memory. In response to a request for reproduction, the ADPCM sound data is read out, decoded, and then sounded. As another example, in a karaoke device, sample sound data is supplied after being compressed with the vector quantizing technique, in addition to MIDI-form music performance data. A music sound is reproduced on the basis of the MIDI-form music performance data, and at the same time a sound is reproduced by decoding the vector-quantized sound data. As another example, in a karaoke device, data obtained by compressing sampled sound data with the vector quantizing technique is mixed with data obtained by compressing sampled data with the ADPCM technique, and in reproduction, a predetermined decoding process is executed after identifying with which of technique is compressed data to be reproduced. As still another example, in a game device, sampled sound data, of human voice, effect sound, etc. are prestored after being compressed with the vector quantizing technique, so that in accordance with progression of a game, the data are read out and decoded for reproductive sounding.

Claims

1. A sound reproducing device comprising:

a receiving device that receives, from outside said sound reproducing device, sound data compressed with a predetermined first data compressing technique;

a first decoding device that decodes the sound data received via said receiving device;

a data compressing device that compresses the sound data, decoded by said first decoding device, with a predetermined second data compressing technique, said first data compressing technique using a data compression rate higher than a data compression rate used by said second data compressing technique;

a second decoding device that decodes the sound data compressed with said second data compressing technique; and

a device that generates a sound signal based on the sound data decoded by said second decoding device.

2. A sound reproducing device as recited in claim 1 wherein the sound data compressed with said first data compressing technique is expressed by a combination of information specifying a spectrum pattern and a spectrum envelope of the sound data with a vector quantizing technique, and said second data compressing technique is based on an adaptive differential pulse code modulation technique.

3. A sound reproducing device comprising:

a receiving device that receives, from outside said sound reproducing device, sound data compressed with a predetermined first data compressing technique;

a first decoding device that decodes the sound data received via said receiving device;

a data compressing device that compresses the sound data, decoded by said first decoding device, with a predetermined second data compressing technique, said first data compressing technique using a data compression rate higher than a data compression rate used by said second data compressing technique;

a storage device that stores therein the sound data compressed with said second data compressing technique by said data compressing device;

a readout device that reads out the sound data from said storage device in response to a sound generating instruction;

a second decoding device that decodes the sound data read out by said readout device; and

a device that generates a sound signal based on the sound data decoded by said second decoding device.

4. A method of transmitting sound data after compressing the sound data and reproducing the sound data in response to a request for real-time sounding, said method comprising the steps of:

transmitting, via a network, sound data compressed with a predetermined first data compressing technique;

receiving the sound data transmitted via the network;

cancelling a compressed state of the received sound data to thereby decode the sound data;

compressing the decoded sound data with a second data compressing technique that uses a data compression rate lower than a data compression rate used by said first data compressing technique;

storing into a memory the sound data compressed with said second data compressing technique;

reading out from said memory the sound data compressed with said second data compressing technique, in response to a request for real-time sounding;

decoding the sound data read out from said memory; and

generating a sound signal based on said sound data decoded after being read out from said memory.

5. A music reproducing device comprising:

a storage device that stores therein automatic performance data to be used for a sequence performance of music, and sound data obtained by coding waveform data of an additional sound, to be reproduced with the music, in a first coding form based on a predetermined data compressing technique;

a receiving device that receives, from outside said sound reproducing device, sound data coded in a predetermined second coding form;

said second coding form being based on a data compressing technique using a data compression rate higher than a data compression rate used for said first coding form;

a first decoding device that decodes the sound data received via said receiving device;

a data coding device that codes the sound data, decoded by said first decoding device, in said first coding form;

a device that allows the sound data, coded by said data coding device, to be stored into said storage device;

a readout device that reads out the automatic performance data and sound data from said storage device in accordance with a music reproducing instruction;

a tone generating device that generates a music sound on the basis of the automatic performance data read out from said storage device;

a second decoding device that decodes the sound data coded by said data coding device in said first coding form; and

a device that mixes an additional sound based on the sound data decoded by said second decoding device with the music sound generated by said tone generating device, for sounding of a mixture of the additional sound and the music sound.

6. A music reproducing device as recited in claim 5 which reproduces karaoke music.

7. A karaoke music reproducing device comprising:

a storage device that, for a given karaoke music piece, stores therein music performance data to be used for reproduction of music and sound data to be reproduced with the music, the sound data being expressed in compressed data form by a combination of first information indexing a spectrum pattern and second information representing a spectrum envelope level with a vector quantizing technique;

a readout device that reads out the music performance data and the sound data from said storage device, in response to an instruction to reproductively perform the karaoke music piece;

a tone generating device that generates a music sound on the basis of the music performance data read out from said storage device;

a decoding device that decodes the sound data read out from said storage device in such a manner that the spectrum pattern indexed by said first information is read out from a table and levels of spectrum components corresponding to the read-out spectrum pattern are set in accordance with the spectrum envelope level represented by said second information, to thereby generate a sound waveform signal; and

a device that acoustically generates a sound of the sound data decoded by said decoding device and the music sound generated by said tone generating device.

8. A karaoke music reproducing device as recited in claim 7 which further comprises a receiving device that receives, from outside said music reproducing device, the music performance data and the sound data of the given karaoke music piece and wherein the received music performance data and the sound data are stored into said storage device.

9. A karaoke music reproducing device as recited in claim 7 wherein said decoding device includes said table storing therein a plurality of spectrum patterns in such a manner that a specific one of the spectrum patterns is read out from said table in response to said first information, and a device that sets respective levels of individual spectrum component waveforms corresponding to the specific spectrum pattern read out from said table in accordance with said spectrum envelope and additively synthesizes the spectrum component waveforms of the set levels to thereby reproduce said sound waveform signal.

10. A karaoke music reproducing device as recited in claim 7 wherein stored contents of said table are rewritable by data given from outside said karaoke music reproducing device.

11. A karaoke music reproducing method comprising the steps of:

transmitting, via a network, music performance data and sound data of a given karaoke music piece, the sound data being expressed in compressed data form by a combination of first information indexing a spectrum pattern and second information representing a spectrum envelope level with a vector quantizing technique;

receiving the music performance data and the sound data transmitted via the network and storing the received music performance data and the sound data into a memory;

reading out the music performance data and the sound data from said memory, in response to a music reproducing instruction;

decoding the sound data read out from said memory in such a manner that the spectrum pattern indexed by said first information is read out from a table and levels of spectrum components corresponding to the read-out spectrum pattern are set in accordance with the spectrum envelope level represented by said second information, to thereby generate a sound waveform signal; and

generating a music sound signal on the basis of the music performance data read out from said memory.

12. A music reproducing device comprising:

a data supply device that supplies music performance data to be used for reproduction of music and sound data to be reproduced with the music, the sound data being compressed with one of a plurality of different data compressing principles including at least one based on a vector quantizing technique;

an identifying device that identifies with which of the data compressing principles the sound data supplied by said data supply device is compressed;

a decoding device that decodes the sound data in accordance with the data compressing principle identified by said identifying device;

a tone generating device that generates a music sound on the basis of the music performance data supplied by said data supply device; and

a device that acoustically generates a sound of the decoded sound data and the music sound generated by said tone generating device.

13. A music reproducing device as recited in claim 12 wherein said different data compressing principles include another one based on an adaptive differential pulse code modulation technique.

14. A music reproducing device as recited in claim 12 wherein the sound data supplied by said data supply device is compressed with a different data compressing principle for each music piece.

15. A music reproducing device as recited in claim 12 wherein the sound data supplied by said data supply device is compressed with a different data compressing principle for each predetermined portion of a music piece.

16. A music reproducing device as recited in claim 12 which reproduces karaoke music.

17. A music reproducing method comprising the steps of:

supplying music performance data to be used for reproduction of music and sound data to be reproduced with the music, the sound data being compressed with one of a plurality of different data compressing principles including at least one based on a vector quantizing technique;

identifying with which of the data compression principles the supplied sound data is compressed;

decoding the sound data in accordance with the identified data compressing principle;

generating a music sound on the basis of the supplied music performance data; and

acoustically generating a sound of the decoded sound data and the generated music sound.